Industry-Verified Manufacturing Data (2026)

Backplane

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Backplane used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Backplane is characterized by the integration of PCB (Printed Circuit Board) and Edge Connectors / Slots. In industrial production environments, manufacturers listed on CNFX commonly emphasize FR-4 (Flame Retardant 4) Glass Epoxy construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A printed circuit board that provides electrical and mechanical connections for multiple modules in a Programmable Logic Controller (PLC) rack.

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Product Specifications

Technical details and manufacturing context for Backplane

Definition
The backplane is a critical component within a Programmable Logic Controller (PLC) rack, serving as the central communication and power distribution backbone. It provides standardized slots and connectors that allow various PLC modules (such as CPU, I/O, communication, and power supply modules) to be installed, interconnected, and powered. It facilitates high-speed data exchange between modules and ensures reliable system operation in industrial automation environments.
Working Principle
The backplane operates by providing a set of parallel electrical pathways (buses) embedded within a printed circuit board. When a module is inserted into a slot on the rack, its edge connector mates with the corresponding connector on the backplane. This establishes connections for power, ground, data, address, and control signals. The backplane's bus architecture allows all connected modules to communicate with the central processing unit (CPU) and with each other according to the PLC's communication protocol (e.g., proprietary backplane bus, PCI, etc.).
Common Materials
FR-4 (Flame Retardant 4) Glass Epoxy, Copper (for traces), Gold or Tin plating (on connectors)
Technical Parameters
  • Number of module slots available on the backplane, determining the maximum expandability of the PLC rack. (slots) Standard Spec
Components / BOM
  • PCB (Printed Circuit Board)
    The substrate that holds and electrically connects all other components via etched copper traces.
    Material: FR-4 Glass Epoxy
  • Edge Connectors / Slots
    Provide the physical and electrical interface for PLC modules to connect to the backplane bus.
    Material: Plastic housing with metal (gold/tin plated) contacts
  • Bus Traces
    Copper pathways on the PCB that carry power, data, address, and control signals between connectors.
    Material: Copper
  • Termination Resistors
    Prevent signal reflections on high-speed bus lines to ensure signal integrity.
    Material: Ceramic, Metal Film
  • Mounting Holes
    Allow the backplane to be securely fastened to the PLC rack chassis.
    Material: N/A (features of the PCB)
Engineering Reasoning
0-60°C ambient temperature, 85-264 VAC input voltage, 0-95% relative humidity non-condensing
PCB substrate glass transition temperature (Tg) of 130°C, copper trace current density exceeding 35 A/mm², connector mating force exceeding 50 N per contact
Design Rationale: Thermal expansion coefficient mismatch between FR-4 substrate (14-17 ppm/°C) and copper traces (16.6 ppm/°C) causing delamination at Tg threshold, electromigration at current densities above 10⁶ A/cm², mechanical fatigue from cyclic thermal stress
Risk Mitigation (FMEA)
Trigger Electrochemical migration due to ionic contamination exceeding 1.56 μg/cm² NaCl equivalent
Mode: Conductive anodic filament growth between adjacent traces at 5 μm/hour rate
Strategy: Conformal coating with 25-75 μm acrylic or polyurethane layer, IPC-CC-830B cleanliness standard implementation
Trigger Vibration-induced fretting at connector interfaces exceeding 15 g RMS acceleration
Mode: Contact resistance increase from 5 mΩ to 500 mΩ over 10⁷ cycles
Strategy: Gold-plated contacts with 0.76 μm minimum thickness, anti-fretting lubricant with 0.5-1.0 cSt viscosity

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Backplane.

PLC rack backplane for industrial automation FR-4 glass epoxy backplane PCB programmable logic controller backplane board machinery equipment backplane with edge connectors industrial automation backplane with bus traces

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Programmable Logic Controller (PLC) Rack
View system integration details
Main PLC Rack
View system integration details
PLC Rack/Chassis
View system integration details
Routing Switch
View system integration details

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: N/A (non-pressurized electrical component)
other spec: Humidity: 5% to 95% non-condensing, Vibration: 5-500 Hz at 2G, Shock: 50G for 11ms
temperature: -40°C to +85°C
Media Compatibility
✓ Industrial control cabinets ✓ Clean manufacturing environments ✓ Temperature-controlled enclosures
Unsuitable: Corrosive chemical exposure or high particulate contamination
Sizing Data Required
  • Number of required module slots
  • Backplane bus architecture (e.g., PCIe, VME, custom)
  • Required power delivery capacity (watts per slot)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Connector pin degradation
Cause: Cyclic thermal expansion/contraction causing fretting corrosion and loss of electrical contact integrity
PCB delamination
Cause: Moisture ingress combined with thermal cycling leading to separation of laminate layers and trace damage
Maintenance Indicators
  • Intermittent system errors or data corruption during vibration or thermal changes
  • Visible discoloration, warping, or charring around connector interfaces
Engineering Tips
  • Implement controlled environment storage with humidity below 40% RH and temperature stabilization before installation
  • Apply periodic contact resistance testing and thermal imaging during preventive maintenance cycles

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 (Quality Management Systems) IEC 61188-5-1 (Printed boards and assemblies - Design and use) IPC-6012 (Qualification and Performance Specification for Rigid Printed Boards)
Manufacturing Precision
  • Board Thickness: +/-10% of nominal
  • Hole Positional Tolerance: +/-0.1mm
Quality Inspection
  • Automated Optical Inspection (AOI) for solder joints and component placement
  • In-Circuit Test (ICT) for electrical continuity and functionality

Factories Producing Backplane

Verified manufacturers with capability to produce this product in China

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✓ 92% Supplier Capability Match Found

S Sourcing Manager from United States Feb 13, 2026
★★★★★
"The technical documentation for this Backplane is very thorough, especially regarding technical reliability."
Technical Specifications Verified
P Procurement Specialist from United Arab Emirates Feb 10, 2026
★★★★☆
"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Backplane so far. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
T Technical Director from Australia Feb 07, 2026
★★★★★
"Testing the Backplane now; the technical reliability results are within 1% of the laboratory datasheet."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

10 sourcing managers are analyzing this specification now. Last inquiry for Backplane from Vietnam (1h ago).

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Frequently Asked Questions

What materials are used in this PLC backplane?

This backplane is constructed with FR-4 glass epoxy PCB material, copper traces for electrical conductivity, and gold or tin plating on connectors for durability and reliable connections in industrial environments.

How does a backplane connect modules in a PLC system?

The backplane provides both electrical and mechanical connections through edge connectors and slots, allowing multiple PLC modules to communicate via bus traces while being securely mounted in the rack.

What are the key components in a backplane BOM?

The bill of materials includes the printed circuit board (PCB), edge connectors/slots for module insertion, bus traces for data transmission, termination resistors for signal integrity, and mounting holes for secure installation in machinery.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Machinery and Equipment Manufacturing sector.

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